From 00dd08cb0fc7a83808bf5883166e182d58187472 Mon Sep 17 00:00:00 2001
From: NicJA <NicJA@fb15a70f-31f2-0310-bbcc-cdcc74a49acc>
Date: Wed, 13 Jun 2018 20:46:59 +0000
Subject: [PATCH] check for -Wshift-negative-value

git-svn-id: https://svn.aros.org/svn/aros/trunk/AROS@55336 fb15a70f-31f2-0310-bbcc-cdcc74a49acc
---
 config/compiler.cfg.in |  2 ++
 config/features        | 32 ++++++++++++++++++++++++++++++++
 config/features.in     | 14 +++++++++++++-
 3 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/config/compiler.cfg.in b/config/compiler.cfg.in
index 1af504e96f..3d79e4d119 100644
--- a/config/compiler.cfg.in
+++ b/config/compiler.cfg.in
@@ -118,6 +118,7 @@ WARN_TAUTOLOGICAL_COMPARE               := @aros_warnflags_tautological_compare@
 WARN_EMPTY_BODY                         := @aros_warnflags_empty_body@
 WARN_STRINGOP_OVERFLOW                  := @aros_warnflags_stringop_overflow@
 WARN_FORMAT_TRUNCATION                  := @aros_warnflags_format_truncation@
+WARN_SHIFT_NEGATIVE_VALUE               := @aros_warnflags_shift_negative_value@
 
 #
 # "Disable" compiler warning flags
@@ -188,3 +189,4 @@ NOWARN_TAUTOLOGICAL_COMPARE             := @aros_nowarnflags_tautological_compar
 NOWARN_EMPTY_BODY                       := @aros_nowarnflags_empty_body@
 NOWARN_STRINGOP_OVERFLOW                := @aros_nowarnflags_stringop_overflow@
 NOWARN_FORMAT_TRUNCATION                := @aros_nowarnflags_format_truncation@
+NOWARN_SHIFT_NEGATIVE_VALUE             := @aros_nowarnflags_shift_negative_value@
diff --git a/config/features b/config/features
index 462be02670..19171a41ba 100755
--- a/config/features
+++ b/config/features
@@ -584,6 +584,8 @@ PACKAGE_URL=
 ac_unique_file="../mmakefile"
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
+aros_nowarnflags_shift_negative_value
+aros_warnflags_shift_negative_value
 aros_nowarnflags_format_truncation
 aros_warnflags_format_truncation
 aros_nowarnflags_stringop_overflow
@@ -3238,6 +3240,7 @@ fi
 #  -Wempty-body
 #  -Wstringop-overflow
 #  -Wformat-truncation
+#  -Wshift-negative-value
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether ${CC} accepts -Werror" >&5
 $as_echo_n "checking whether ${CC} accepts -Werror... " >&6; }
@@ -4943,6 +4946,33 @@ if test "x-$aros_format_truncation" = "x-yes" ; then
     aros_nowarnflags_format_truncation=-Wno-format-truncation
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether ${CC} accepts -Wshift-negative-value" >&5
+$as_echo_n "checking whether ${CC} accepts -Wshift-negative-value... " >&6; }
+CFLAGS=-Wshift-negative-value
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  aros_shift_negative_value="yes"
+else
+  aros_shift_negative_value="no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $aros_shift_negative_value" >&5
+$as_echo "$aros_shift_negative_value" >&6; }
+if test "x-$aros_shift_negative_value" = "x-yes" ; then
+    aros_warnflags_shift_negative_value=-Wshift-negative-value
+    aros_nowarnflags_shift_negative_value=-Wno-shift-negative-value
+fi
+
 #
 # export the feature flags...
 #
@@ -5106,6 +5136,8 @@ fi
 
 
 
+
+
 ac_config_files="$ac_config_files ${aros_targetcfg_dir}/compiler.cfg:compiler.cfg.in"
 
 
diff --git a/config/features.in b/config/features.in
index 09417f402d..1e3331236e 100644
--- a/config/features.in
+++ b/config/features.in
@@ -256,6 +256,7 @@ fi
 #  -Wempty-body
 #  -Wstringop-overflow
 #  -Wformat-truncation
+#  -Wshift-negative-value
 
 AC_MSG_CHECKING([whether ${CC} accepts -Werror])
 CFLAGS=-Werror
@@ -827,6 +828,15 @@ if test "x-$aros_format_truncation" = "x-yes" ; then
     aros_nowarnflags_format_truncation=-Wno-format-truncation
 fi
 
+AC_MSG_CHECKING([whether ${CC} accepts -Wshift-negative-value])
+CFLAGS=-Wshift-negative-value
+AC_TRY_COMPILE(,, aros_shift_negative_value="yes", aros_shift_negative_value="no")
+AC_MSG_RESULT($aros_shift_negative_value)
+if test "x-$aros_shift_negative_value" = "x-yes" ; then
+    aros_warnflags_shift_negative_value=-Wshift-negative-value
+    aros_nowarnflags_shift_negative_value=-Wno-shift-negative-value
+fi
+
 #
 # export the feature flags...
 #
@@ -989,7 +999,9 @@ AC_SUBST(aros_warnflags_stringop_overflow)
 AC_SUBST(aros_nowarnflags_stringop_overflow)
 AC_SUBST(aros_warnflags_format_truncation)
 AC_SUBST(aros_nowarnflags_format_truncation)
-
+AC_SUBST(aros_warnflags_shift_negative_value)
+AC_SUBST(aros_nowarnflags_shift_negative_value)
+    
 AC_CONFIG_FILES(
     ${aros_targetcfg_dir}/compiler.cfg:compiler.cfg.in
 )
-- 
2.11.4.GIT